Linear friction welding of Al-Cu Part 2 - Interfacial characteristics

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DOIResolve DOI: http://doi.org/10.1179/000844311X13112418194671
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TypeArticle
Journal titleCanadian Metallurgical Quarterly
Volume50
Issue4
Pages360370; # of pages: 11
SubjectLinear friction welding; Intermetallic phases; Interfacial growth
AbstractMetallurgically bonded aluminium-copper assemblies are used as electrical transition pieces in high direct current bus systems to transmit electricity. The brittle, high electrical resistance intermetallics that tend to form at the interface between these two materials are problematic for the electrical conductivity and efficiency of the connector. The manufacture of such assemblies therefore requires low heat input during joining so as to minimise the extent of formation of the intermetallic phases. The application of linear friction welding (LFW), an emerging high energy density solid state joining technology, for this purpose limits the formation of the intermetallic phases and produces more promising interfacial characteristics. In this work, aluminium-copper assemblies with two different geometries, namely, laboratory scale and full scale (customised to actual industrial requirements) were produced by LFW. These were characterised using scanning electron microscopy (SEM), electron probe microanalysis (EPMA) and energy dispersive spectrometry (EDS) to identify the phases at the interface. In order to simulate the in-service behaviour of the aluminium-copper assemblies manufactured by LFW, the laboratory scale samples were heat treated at 300°C. The evolution in the interfacial region was compared with that of post-service connectors produced by explosive welding (EW) and LFW.
Publication date
LanguageEnglish
AffiliationNRC Institute for Aerospace Research; National Research Council Canada
Peer reviewedYes
NPARC number19726586
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Record identifierddb8513f-070c-4b42-9bb3-1aa80ec94cfb
Record created2012-03-26
Record modified2016-05-09
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